In order to join the Musketeers, young D'Artagnan is embroiled in a plot in which Cardinal of Richelieu tries to take control of power from the King of France, along with Rochefort and Milady de Winter,
D'Artagnan is back from England with a message for the queen. Buckingham has declared that he was ready to attack France to deliver Anne of Austria. D'Artagnan ends up arrested and thrown into prison. Musketeers wonder how to rescue their friend.